Question

An electric dipole has the magnitude of its charge as q and
its dipole moment is p. It is placed in uniform electric field E.
If its dipole moment is along the direction of the field, the
force on it and its potential energy are respectively.
(a) q.E and max. (b) 2 q.E and min.
(c) q.E and min (d) zero and min.

Answer 1

Answer:

I think (a) is the right ans

Answer 2

Answer:Option (d)

Explanation:As p and E are in the same direction, angle between them is zero. Hence potential energy, U= -pEcos0

                                                           = -pE×1

                                                           = -pE , which is minimum

Also in uniform electric feild, F/t=0

                                              ie, F=0